Visual observation (s) alone won't help identify paintings and gemstones. The concept/technique (s) used for identifying origin / treatments of paintings are very similar to origin and treatments detection of gemstones with analytical instruments. The results are always surprising.
Laurie Hurwitz writes about the advanced three dimensional high resolution laser scanning system the experts used for extensive analysis of the Mona Lisa portrait + other viewpoints @ http://artnews.com/issues/article.asp?art_id=2194
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